I got my period on the 12th of April. I had unprotected sex on the 5th day of my period which was the 16th. We weren't sure and to be safe I had a pill on the 18th of April which was within 72 hours. On the 3rd of May I started bleeding , which was not as heavy as my regular period but lasted 4-5 days. I had regular period symptoms like cramps and back pain. I wasn't sure if that was withdrawal bleeding or my period that came in early. It's the 20th , but I haven't got my period as yet, assuming that was withdrawal bleeding. Are there chances of being pregnant